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Does anyone know the mathmatical formula to figure out how many cubic feet is in your tank at whatever pressure it is? Lets say you have a HP100 and at 3500psi it has 100 cubic feet of air in it, well how many cubic feet does it have when it is 2300psi? Maybe this has already been dicussed but I...

Hi, I'm new to the site. I've poked around here a little and it seems pretty cool so far. Looking forward to meeting new people and reading about other's adventures. Maybe I can learn something on here also and can make me a better diver..